Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
79.0
65
88
80
77
92
February
73.8
80
82
73
59
85
March
74.2
71
62
81
74
78
April
79.9
89
75
81
79
May
93.6
94
86
90
94
June
98.5
97
99
96
99
July
98.3
99
96
100
100
August
98.7
97
100
100
99
September
97.5
98
98
95
99
October
92.4
89
90
90
97
November
86.5
92
89
78
78
December
72.0
78
46
84
56
Average
86.1
71.5
89.4
86.6
86.3
88.8
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.